Spark-plug.



W. H. GATES.

SPARK PLUG.

APPUCATION FILED FEB. 28, 1913.

Patent-ed May 25, 1915,

Wmmed UNITED STATES PATENT OFFICE.

WILLIAM H. GATES, OF NEW.HAVEN, CONNECTICUT, ASSIGNOR TO EASTERN MACHINESCREW CORPORATION, OF NECTICUT.

NEW HAVEN, CONNECTICUT, A CORPORATION OF CON- SPARK-PLUG.

To all'whom it may concern: I

Be it known that I, WILLIAM H. GATES, a citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented a new and useful Spark-Plug, of which thefollowing is a specification.

The object of this invention is to provide a new and improved spark pluconstruction, and particularly relates to t e packing for sealing theporcelain to the base.

The invention is illustrated in the accompanying drawing, in which-Figure 1 is a sectional elevation of the improved construction; and Fig.2 is a sectional elevation of the packing on an enlarged scale. I p I-Referring to the drawing, A designates the usual base which is providedwith a screw-threaded shank to engage into the wall of the motorcylinder.

B designates the porcelain which fits-into said base, and which has ashoulder O. A conductor D having a head E at its lower end is passedthrough said orcelain, and a nut F is threaded thereon. he usual bindingnut G is also threaded m, the end of the conductor D. a H designates atubular nut which is threaded into the top of the base A.

J designates the improved ring packin The same is made of 'compositionor so is metal, and is provided with a V-shaped' groove K in its upperface, the groove formmg outer and inner annular flanges IQ and 11. Thepacking is also providedwith a depending lower flange 12. The. lower endof the nut H is shaped to engage the top edges of the flanges 10 and 11.A soft metal packing L is usually arranged in the base A for theshoulder C of the porcelain to bear u on.

The base A is provided with one or more i metallic terminals a,aset insuch'relation to the headkE as to a or spar gaps. v g iii assembling theparts, the soft metal form the usual spark L Specification of Letterslatent.

Application filed February 28, 1913. Serial No. 751,235.

- packing J is. so shaped that the action of Patented May 25, 1915.

' packing L is placed in the base A, the porcelain B then fitted intothe base, the packmg J placed on top of the shoulder C of the porcelain,and the nut H then threaded into the base A. As the lower end of-the nutengaggs the packing J, the annular flange 10 will forced outwardly toengage withthe base A, and the inner flange 11 will be forced inwardlyto engage with the porcelain B. Thus a very tig t joint is made betweenthe parts.

The depending lower flange 12 of the pressure on the same will tend toexpand the same into contact with the base A. Thus a very simple andeflicient construction is provided'which will be free from leakage.

The details and arrangements herein shown and described may be greatlyvaried by a skilled mechanic without departing from the scope of theinvention as expressed in the claim.

Having thus fully described my invention,

what I claim and desire to secure by Letters- Patent is:

A spark plug comprising a base, a shoul-- dered porcelain seatedtherein, a conductor extending through the porcelain, a tubular nutthreaded into the base, and a ring packing arranged between the nut andthe shoulder on the porcelain, said packing having a pair of upwardlyextending flanges on its upper edge separated by a V-shaped groove, andsaid nut having its lower end shaped toen age said flanges near theirtop edges and being effective when tightened to force one flange of thepacking outwardly against the base and forcethe other flange of thepacking inwardly against the porcelain thereby sealing the "porcelain inthe base.

In testimony whereof I have hereunto set my hand, in t e presence of twosubscribing wltnesses.

' WILLIAM H. GATES.

Witnesses:

BENJ. P. Gamma,

